2. Developing with the SDK

Please refer the Release Notes to know more about the releases

2.1 Development Setup

This section talks about setting up your development host, fetching the Git repositories, and instructions to build and flash.

2.1.1 Host Setup

You should install drivers and support packages for your development host. Linux and Mac OS-X are the supported development hosts in Matter, the recommended host versions:

  • Ubuntu 20.04 or 22.04 LTS

  • macOS 10.15 or later

Additionally, we also support developing on Windows Host using WSL.

2.1.1.1 Windows 10

Development on Windows is supported using Windows Subsystem for Linux (WSL). Please follow the below instructions to set up host.

  • Install and enable Windows Subsystem for Linux 2 (WSL2).

  • Install Ubuntu 20.04 or 22.04 from the Windows App Store.

  • Start Ubuntu (search into start menu) and run command uname -a, it should report a kernel version of 5.10.60.1 or later. If not please upgrade the WSL2. To upgrade the kernel, run wsl --upgrade from Windows Power Shell.

  • Windows does not support exposing COM ports to WSL distros. Install usbipd-win on Windows and WSL (usbipd-win WSL Support).

  • Here onwards process for setting esp-matter and building examples is same as other hosts.

  • Please clone the repositories from inside the WSL environment and not inside a mounted directory.

For using CHIP tool on WSL, please check Using CHIP-tool in WSL.

For using VSCode for development, please check Developing in WSL.

2.1.2 Getting the Repositories

Before cloning the repositories please confirm that the following Prerequisites are fulfilled.

The Prerequisites for ESP-IDF and Matter:

Note

git clone command accepts the optional argument --jobs N, which can significantly speed up the process by parallelizing submodule cloning. Consider using this option when cloning repositories. It is also applicable when using ./scripts/checkout_submodules.py to clone Matter submodules.

Cloning esp-idf:

git clone --recursive https://github.com/espressif/esp-idf.git
cd esp-idf; git checkout v5.2.1; git submodule update --init --recursive;
./install.sh
cd ..

Cloning the esp-matter repository takes a while due to a lot of submodules in the upstream connectedhomeip, so if you want to do a shallow clone use the following command:

  • For Linux host:

    cd esp-idf
    source ./export.sh
    cd ..
    
    git clone --depth 1 https://github.com/espressif/esp-matter.git
    cd esp-matter
    git submodule update --init --depth 1
    cd ./connectedhomeip/connectedhomeip
    ./scripts/checkout_submodules.py --platform esp32 linux --shallow
    cd ../..
    ./install.sh
    cd ..
    
  • For Mac OS-X host:

    cd esp-idf
    source ./export.sh
    cd ..
    
    git clone --depth 1 https://github.com/espressif/esp-matter.git
    cd esp-matter
    git submodule update --init --depth 1
    cd ./connectedhomeip/connectedhomeip
    ./scripts/checkout_submodules.py --platform esp32 darwin --shallow
    cd ../..
    ./install.sh
    cd ..
    

Note

The modules for platform linux or darwin are required for the host tools building.

To clone the esp-matter repository with all the submodules, use the following command:

cd esp-idf
source ./export.sh
cd ..

git clone --recursive https://github.com/espressif/esp-matter.git
cd esp-matter
./install.sh
cd ..

Note

If it runs into some errors like:

dial tcp 108.160.167.174:443: connect: connection refused
ConnectionResetError: [Errno 104] Connection reset by peer

It’s probably caused by some network connectivity issue, a VPN is required for most of the cases.

2.1.3 Configuring the Environment

This should be done each time a new terminal is opened

cd esp-idf; source ./export.sh; cd ..
cd esp-matter; source ./export.sh; cd ..

Enable Ccache for faster IDF builds.

Ccache is a compiler cache. Matter builds are very slow and takes a lot of time. Ccache caches the previous compilations and speeds up recompilation in subsequent builds.

export IDF_CCACHE_ENABLE=1

Above can also be added to your shell’s profile file (.profile, .bashrc, .zprofile, etc.) to enable ccache every time you open a new terminal.

2.1.4 Building Applications

2.1.5 Flashing the Firmware

Choose IDF target.

idf.py set-target esp32
  • If IDF target has not been set explicitly, then esp32 is considered as default.

  • The default device for esp32/esp32c3 is esp32-devkit-c/esp32c3-devkit-m. If you want to use another device, you can export ESP_MATTER_DEVICE_PATH after choosing the correct target, e.g. for m5stack device: export ESP_MATTER_DEVICE_PATH=/path/to/esp_matter/device_hal/device/m5stack

    • If the device that you have is of a different revision, and is not working as expected, you can create a new device and export your device path.

    • The other peripheral components like led_driver, button_driver, etc. are selected based on the device selected.

    • The configuration of the peripheral components can be found in $ESP_MATTER_DEVICE_PATH/esp_matter_device.cmake.

(When flashing the SDK for the first time, it is recommended to do idf.py erase_flash to wipe out entire flash and start out fresh.)

idf.py flash monitor

Note

If you are getting build errors like:

ERROR: This script was called from a virtual environment, can not create a virtual environment again

It can be fixed by running below command:

pip install -r $IDF_PATH/requirements.txt

2.2 Commissioning and Control

There are a few implementations of Matter commissioners present in the connectedhomeip repository.

CHIP Tool is an example implementation of Matter commissioner and used for development purposes.

Espressif also has an iOS application, Espressif-Matter, to commission and control the Matter devices. Please follow profile installation instructions in order to use the application. Also, make sure to enable Developer Mode on the iOS.

2.2.1 Test Setup (CHIP Tool)

A host-based chip-tool can be used as a commissioner to commission and control a Matter device. During the previous install.sh step, the chip-tool is generated under the folder:

${ESP_MATTER_PATH}/connectedhomeip/connectedhomeip/out/host

2.2.1.1 Commissioning

Use chip-tool in interactive mode to commission the device:

chip-tool interactive start
pairing ble-wifi 0x7283 <ssid> <passphrase> 20202021 3840

In the above commands:

  • 0x7283 is the randomly chosen node_id

  • 20202021 is the setup_passcode

  • 3840 is the discriminator

Above method commissions the device using setup passcode and discriminator. Device can also be commissioned using manual pairing code or QR code.

To Commission the device using manual pairing code 34970112332

pairing code-wifi 0x7283 <ssid> <passphrase> 34970112332

Above default manual pairing code contains following values:

Version:             0
Custom flow:         0      (STANDARD)
Discriminator:       3840
Passcode:            20202021

To commission the device using QR code MT:Y.K9042C00KA0648G00

pairing code-wifi 0x7283 <ssid> <passphrase> MT:Y.K9042C00KA0648G00

Above QR Code contains the below default values:

Version:             0
Vendor ID:           65521    (0xFFF1)
ProductID:           32768    (0x8000)
Custom flow:         0        (STANDARD)
Discovery Bitmask:   0x02     (BLE)
Long discriminator:  3840     (0xf00)
Passcode:            20202021

Alternatively, you can scan the below QR code image using Matter commissioners.

MT:Y.K9042C00KA0648G00

If QR code is not visible, paste the below link into the browser and scan the QR code.

https://project-chip.github.io/connectedhomeip/qrcode.html?data=MT:Y.K9042C00KA0648G00

If you want to use different values for commissioning the device, please use the mfg-tool to generate the factory partition which has to be flashed on the device. It also generates the new pairing code and QR code image using which you can commission the device.

2.2.1.2 Post Commissioning Setup

The device would need additional configuration depending on the example, for it to work. Check the “Post Commissioning Setup” section in examples for more information.

2.2.1.3 Cluster Control

Use the cluster commands to control the attributes.

onoff toggle 0x7283 0x1
onoff on 0x7283 0x1
levelcontrol move-to-level 10 0 0 0 0x7283 0x1
levelcontrol move-to-level 100 0 0 0 0x7283 0x1
colorcontrol move-to-saturation 200 0 0 0 0x7283 0x1
colorcontrol move-to-hue 150 0 0 0 0 0x7283 0x1

chip-tool when used in interactive mode uses CASE resumption as against establishing CASE for cluster control commands. This results into shorter execution times, thereby improving the overall experience.

For more details on chip-tool usage, check https://github.com/espressif/connectedhomeip/tree/v1.0.0.2/examples/chip-tool

2.3 Device console

The console on the device can be used to run commands for testing. It is configurable through menuconfig and enabled by default in the firmware. Here are some useful commands:

  • BLE commands: Start and stop BLE advertisement:

    matter ble [start|stop|state]
    
  • Wi-Fi commands: Set and get the Wi-Fi mode:

    matter wifi mode [disable|ap|sta]
    
  • Device configuration: Dump the device static configuration:

    matter config
    
  • Factory reset:

    matter device factoryreset
    
  • On-boarding codes: Dump the on-boarding pairing code payloads:

    matter onboardingcodes
    

Additional Matter specific commands:

  • Get attribute: (The IDs are in hex):

    matter esp attribute get <endpoint_id> <cluster_id> <attribute_id>
    
    • Example: on_off::on_off:

      matter esp attribute get 0x1 0x6 0x0
      
  • Set attribute: (The IDs are in hex):

    matter esp attribute set <endpoint_id> <cluster_id> <attribute_id> <attribute value>
    
    • Example: on_off::on_off:

      matter esp attribute set 0x1 0x6 0x0 1
      
  • Diagnostics:

    matter esp diagnostics mem-dump
    
  • Wi-Fi

    matter esp wifi connect <ssid> <password>
    

2.4 Developing your Product

Understanding the structure before actually modifying and customising the device is helpful.

2.4.1 Building a Color Temperature Lightbulb

A device is represented in Matter in terms of its data model. As a first step of building your product, you will have to define the data model for your device. Matter has a standard set of device types already defined that you can use. Please refer to the Espressif Matter Blog for clarity on the terms like endpoints, clusters, etc. that are used in this section.

2.4.1.1 Data Model

  • Typically, the data model is defined in the example’s app_main.cpp. First off we start by creating a Matter node, which is the root of the Data Model.

    node::config_t node_config;
    node_t *node = node::create(&node_config, app_attribute_update_cb, NULL);
    
  • We will use the color_temperature_light standard device type in this case. All standard device types are available in esp_matter_endpoint.h header file. Each device type has a set of default configuration that can be specific as well.

    color_temperature_light::config_t light_config;
    light_config.on_off.on_off = DEFAULT_POWER;
    light_config.level_control.current_level = DEFAULT_BRIGHTNESS;
    endpoint_t *endpoint = color_temperature_light::create(node, &light_config, ENDPOINT_FLAG_NONE);
    

    In this case, we create the light using the color_temperature_light::create() function. Similarly, multiple endpoints can be created on the same node. Check the following sections for more info.

2.4.1.2 Attribute Callback

  • Whenever a Matter client makes changes to the device, they end up updating the attributes in the data model.

  • When an attribute is updated, the attribute_update_cb is used to notify the application of this change. You would typically call device driver specific APIs for executing the required action. Here, if the callback type is PRE_UPDATE, the driver is updated first. If that is a success, only then the attribute value is actually updated in the database.

    esp_err_t app_attribute_update_cb(callback_type_t type, uint16_t endpoint_id, uint32_t cluster_id,
                                      uint32_t attribute_id, esp_matter_attr_val_t *val, void *priv_data)
    {
        esp_err_t err = ESP_OK;
    
        if (type == PRE_UPDATE) {
            /* Driver update */
            err = app_driver_attribute_update(endpoint_id, cluster_id, attribute_id, val);
        }
    
        return err;
    }
    

2.4.1.3 Device Drivers

  • The drivers, depending on the device, are typically initialized and updated in the example’s app_driver.cpp.

    esp_err_t app_driver_init()
    {
        ESP_LOGI(TAG, "Initialising driver");
    
        /* Initialize button */
        button_config_t button_config = button_driver_get_config();
        button_handle_t handle = iot_button_create(&button_config);
        iot_button_register_cb(handle, BUTTON_PRESS_DOWN, app_driver_button_toggle_cb);
        app_reset_button_register(handle);
    
        /* Initialize led */
        led_driver_config_t led_config = led_driver_get_config();
        led_driver_init(&led_config);
    
        app_driver_attribute_set_defaults();
        return ESP_OK;
    }
    
  • The driver’s attribute update API just handles the attributes that are actually relevant for the device. For example, a color_temperature_light handles the power, brightness, hue, saturation and temperature.

    esp_err_t app_driver_attribute_update(uint16_t endpoint_id, uint32_t cluster_id, uint32_t attribute_id,
                                          esp_matter_attr_val_t *val)
    {
        esp_err_t err = ESP_OK;
        if (endpoint_id == light_endpoint_id) {
            if (cluster_id == OnOff::Id) {
                if (attribute_id == OnOff::Attributes::OnOff::Id) {
                    err = app_driver_light_set_power(val);
                }
            } else if (cluster_id == LevelControl::Id) {
                if (attribute_id == LevelControl::Attributes::CurrentLevel::Id) {
                    err = app_driver_light_set_brightness(val);
                }
            } else if (cluster_id == ColorControl::Id) {
                if (attribute_id == ColorControl::Attributes::CurrentHue::Id) {
                    err = app_driver_light_set_hue(val);
                } else if (attribute_id == ColorControl::Attributes::CurrentSaturation::Id) {
                    err = app_driver_light_set_saturation(val);
                } else if (attribute_id == ColorControl::Attributes::ColorTemperature::Id) {
                    err = app_driver_light_set_temperature(val);
                }
            }
        }
        return err;
    }
    

2.4.2 Defining your own data model

This section demonstrates creating standard endpoints, clusters, attributes, and commands that are defined in the Matter specification

2.4.2.1 Endpoints

The device can be customized by editing the endpoint/device_type creating in the app_main.cpp of the example. Examples:

  • on_off_light:

    on_off_light::config_t light_config;
    endpoint_t *endpoint = on_off_light::create(node, &light_config, ENDPOINT_FLAG_NONE);
    
  • fan:

    fan::config_t fan_config;
    endpoint_t *endpoint = fan::create(node, &fan_config, ENDPOINT_FLAG_NONE);
    
  • door_lock:

    door_lock::config_t door_lock_config;
    endpoint_t *endpoint = door_lock::create(node, &door_lock_config, ENDPOINT_FLAG_NONE);
    
  • window_covering_device:

    window_covering_device::config_t window_covering_device_config(static_cast<uint8_t>(chip::app::Clusters::WindowCovering::EndProductType::kTiltOnlyInteriorBlind));
    endpoint_t *endpoint = window_covering_device::create(node, &window_covering_config, ENDPOINT_FLAG_NONE);
    

    The window_covering_device config_t structure includes a constructor that allows specifying an end product type different than the default one, which is “Roller shade”. Once a config_t instance has been instantiated, its end product type cannot be modified.

  • pump

    pump::config_t pump_config(1, 10, 20);
    endpoint_t *endpoint = pump::create(node, &pump_config, ENDPOINT_FLAG_NONE);
    

    The pump config_t structure includes a constructor that allows specifying maximum pressure, maximum speed and maximum flow values. If they aren’t set, they will be set to null by default. Once a config_t instance has been instantiated, these three values cannot be modified.

2.4.2.2 Clusters

Additional clusters can also be added to an endpoint. Examples:

  • on_off:

    on_off::config_t on_off_config;
    cluster_t *cluster = on_off::create(endpoint, &on_off_config, CLUSTER_FLAG_SERVER, on_off::feature::lighting::get_id());
    
  • temperature_measurement:

    temperature_measurement::config_t temperature_measurement_config;
    cluster_t *cluster = temperature_measurement::create(endpoint, &temperature_measurement_config, CLUSTER_FLAG_SERVER);
    
  • window_covering:

    window_covering::config_t window_covering_config(static_cast<uint8_t>(chip::app::Clusters::WindowCovering::EndProductType::kTiltOnlyInteriorBlind));
    cluster_t *cluster = window_covering::create(endpoint, &window_covering_config, CLUSTER_FLAG_SERVER);
    

    The window_covering config_t structure includes a constructor that allows specifying an end product type different than the default one, which is “Roller shade”. Once a config_t instance has been instantiated, its end product type cannot be modified.

  • pump_configuration_and_control:

    pump_configuration_and_control::config_t pump_configuration_and_control_config(1, 10, 20);
    cluster_t *cluster = pump_configuration_and_control::create(endpoint, &pump_configuration_and_control_config, CLUSTER_FLAG_SERVER);
    

    The pump_configuration_and_control config_t structure includes a constructor that allows specifying maximum pressure, maximum speed and maximum flow values. If they aren’t set, they will be set to null by default. Once a config_t instance has been instantiated, these three values cannot be modified.

2.4.2.3 Attributes and Commands

Additional attributes and commands can also be added to a cluster. Examples:

  • attribute: on_off:

    bool default_on_off = true;
    attribute_t *attribute = on_off::attribute::create_on_off(cluster, default_on_off);
    
  • attribute: cluster_revision:

    uint16_t default_cluster_revision = 1;
    attribute_t *attribute = global::attribute::create_cluster_revision(cluster, default_cluster_revision);
    
  • command: toggle:

    command_t *command = on_off::command::create_toggle(cluster);
    
  • command: move_to_level:

    command_t *command = level_control::command::create_move_to_level(cluster);
    

2.4.2.4 Features

Optional features which are applicable to a cluster can also be added.

  • feature: taglist: Descriptor cluster:

    cluster_t* cluster = cluster::get(endpoint, Descriptor::Id);
    descriptor::feature::taglist::add(cluster);
    

2.4.3 Adding custom data model fields

This section demonstrates creating custom endpoints, clusters, attributes, and commands that are not defined in the Matter specification and can be specific to the vendor.

2.4.3.1 Endpoints

Non-Standard endpoint can be created, without any clusters.

  • Endpoint create:

    endpoint_t *endpoint = endpoint::create(node, ENDPOINT_FLAG_NONE);
    

2.4.3.2 Clusters

Non-Standard/Custom clusters can also be created:

  • Cluster create:

    uint32_t custom_cluster_id = 0x131bfc00;
    cluster_t *cluster = cluster::create(endpoint, custom_cluster_id, CLUSTER_FLAG_SERVER);
    

2.4.3.3 Attributes and Commands

Non-Standard/Custom attributes can also be created on any cluster:

  • Attribute create:

    uint32_t custom_attribute_id = 0x0;
    uint16_t default_value = 100;
    attribute_t *attribute = attribute::create(cluster, custom_attribute_id, ATTRIBUTE_FLAG_NONE, esp_matter_uint16(default_value);
    
  • Command create:

    static esp_err_t command_callback(const ConcreteCommandPath &command_path, TLVReader &tlv_data, void
    *opaque_ptr)
    {
       ESP_LOGI(TAG, "Custom command callback");
       return ESP_OK;
    }
    
    uint32_t custom_command_id = 0x0;
    command_t *command = command::create(cluster, custom_command_id, COMMAND_FLAG_ACCEPTED, command_callback);
    

2.4.4 Advanced Setup

This section explains adding external platforms for Matter. This step is optional for most devices. Espressif’s SDK for Matter provides support for overriding the default platform layer, so the BLE and Wi-Fi implementations can be customized. Here are the required steps for adding an external platform layer.

2.4.4.1 Creating the external platform directory

Create a directory platform/${NEW_PLATFORM_NAME} in your codebase. You can typically copy ${ESP_MATTER_PATH}/connectedhomeip/connectedhomeip/src/platform/ESP32 as a start. Note that the new platform name should be something other than ESP32. In this article we’ll use ESP32_custom as an example. The directory must be under platform folder to meet the Matter include path conventions.

2.4.4.2 Modifying the BUILD.gn target

There is an example BUILD.gn file for the ESP32_custom example platform. It simply compiles the ESP32 platform in Matter without any modifications.

  • The new platform directory must be added to the Matter include path. See the ESP32_custom_include config in the above mentioned file.

  • Multiple build configs must be exported to the build system. See the buildconfig_header section in the file for the required definitions.

2.4.4.3 Editing Kconfigs

  • Enable CONFIG_CHIP_ENABLE_EXTERNAL_PLATFORM.

  • Set CONFIG_CHIP_EXTERNAL_PLATFORM_DIR to the relative path from ${ESP_MATTER_PATH}/connectedhomeip/connectedhomeip/config/esp32 to the external platform directory. For instance, if your source tree is:

    my_project
    ├── esp-matter
    └── platform
       └── ESP32_custom
    

    Then CONFIG_CHIP_EXTERNAL_PLATFORM_DIR would be ../../../../../platform/ESP32_custom.

  • Disable CONFIG_BUILD_CHIP_TESTS.

  • If your external platform does not support the connectedhomeip/connectedhomeip/src/lib/shell/ provided in the Matter shell library, then disable CONFIG_ENABLE_CHIP_SHELL.

2.4.4.4 Example Usage

As an example, you can build light example on ESP32_custom platform with following steps:

mkdir $ESP_MATTER_PATH/../platform
cp -r $ESP_MATTER_PATH/connectedhomeip/connectedhomeip/src/platform/ESP32 $ESP_MATTER_PATH/../platform/ESP32_custom
cp $ESP_MATTER_PATH/examples/common/external_platform/BUILD.gn $ESP_MATTER_PATH/../platform/ESP32_custom
cd $ESP_MATTER_PATH/examples/light
cp sdkconfig.defaults.ext_plat_ci sdkconfig.defaults
idf.py build

2.5 Factory Data Providers

2.5.1 Providers Introduction

There are four factory data providers, each with its own implementation, that need to be configured. These providers supply the device with necessary factory data, which is then read by the device according to their respective implementations.

  • Commissionable Data Provider

    This particular provider is responsible for retrieving commissionable data, which includes information such as setup-discriminator, spake2p-iteration-count, spake2p-salt, spake2p-verifier, and setup-passcode.

  • Device Attestation Credentials(DAC) Provider

    This particular provider is responsible for retrieving device attestation credentials, which includes information such as CD, firmware-information, DAC, and PAI certificate. And it can also sign message with the DAC private key.

  • Device Instance Info Provider

    This particular provider is responsible for retrieving device instance information, which includes vendor-name, vendor-id, product-name, product-id, product-url, product-label, hardware-version-string, hardware-version, rotating-device-id-unique-id, serial-number, manufacturing-data, and part-number.

  • Device Info Provider

    This particular provider is responsible for retrieving device information, which includes fixed-labels, user-labels, supported-locales, and supported-calendar-types.

2.5.2 Configuration Options

Different implementations of the four providers can be chosen in meuconfig:

  • Commissionable Data Provider options in Component config ESP Matter

    When selecting Commissionable Data - Test, the device will use the hardcoded Commissionable Data. This uses the legacy commissionable data provider and provides the test values. These test values are enclosed in CONFIG_ENABLE_TEST_SETUP_PARAMS option and enabled by default.

    When selecting Commissionable Data - Factory, the device will use commissionable data information from the factory partition. This option is visable only when CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER is selected.

    When selecting Commissionable Data - Custom, the device will use the custom defined commissionable data provider to obtain commissionable data information. esp_matter::set_custom_commissionable_data_provider() should be called before esp_matter::start() to set the custom provider.

    If you are using Factory or Custom commissionable data provides, then disable the CONFIG_ENABLE_TEST_SETUP_PARAMS option.

  • DAC Provider options in Component config ESP Matter

    When selecting Attestation - Test, the device will use the hardcoded Device Attestation Credentials.

    When selecting Attestation - Factory, the device will use the Device Attestation Credentials in the factory partition binary. This option is visable only when CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER is selected.

    When selecting Attestation - Secure Cert, the device will use the Device Attestation Credentials in the secure cert partition. This option is for the Pre-Provisioned Modules. And the original vendor ID and product ID should be added to the CD file for the Pre-Provisioned Modules. Please contact your Espressif contact person for more information.

    When selecting Attestation - Custom, the device will use the custom defined DAC provider to obtain the Device Attestation Credentials. esp_matter::set_custom_dac_provider() should be called before esp_matter::start() to set the custom provider.

  • Device Instance Info Provider options in Component config ESP Matter

    When selecting Device Instance Info - Test, the device will use the hardcoded Device Instance Information.

    When selecting Device Instance Info - Factory, the device will use device instance information from the factory partition. This option is visable only when CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER and ENABLE_ESP32_DEVICE_INSTANCE_INFO_PROVIDER is selected.

    When selecting Device Instance Info - Custom, the device will use custom defined Device Instance Info Provider to obtain the Device Instance Information. esp_matter::set_custom_device_instance_info_provider should be called before esp_matter::start() to set the custom provider.

  • Device Info Provider options in Component config ESP Matter

    When selecting Device Info - None, the device will not use any device information provider. It should be selected when there are not related clusters on the device.

    When selecting Device Info - Factory, the device will use device information from the factory partition. This option is visable only when CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER and ENABLE_ESP32_DEVICE_INFO_PROVIDER is selected.

    When selecting Device Info - Custom, the device will use custom defined Device Info Provider to obtain the Device Information. esp_matter::set_custom_device_info_provider should be called before esp_matter::start() to set the custom provider.

2.5.3 Custom Providers

In order to use custom providers, you need to define implementations of the four base classes of the providers and override the functions within them. And the custom providers should be set before esp_matter::start() is called.

2.6 Using esp_secure_cert partition

2.6.1 Configuration Options

Build the firmware with below configuration options

# Disable the DS Peripheral support
CONFIG_ESP_SECURE_CERT_DS_PERIPHERAL=n

# Use DAC Provider implementation which reads attestation data from secure cert partition
CONFIG_SEC_CERT_DAC_PROVIDER=y

# Enable some options which reads CD and other basic info from the factory partition
CONFIG_ENABLE_ESP32_FACTORY_DATA_PROVIDER=y
CONFIG_ENABLE_ESP32_DEVICE_INSTANCE_INFO_PROVIDER=y
CONFIG_FACTORY_COMMISSIONABLE_DATA_PROVIDER=y
CONFIG_FACTORY_DEVICE_INSTANCE_INFO_PROVIDER=y

2.6.2 Certification Declaration

If you do not have an certification declaration file then you can generate the test CD with the help of below mentioned steps. We need to generate the new CD because it SHALL match the VID, PID in DAC and the ones reported by basic cluster.

  • Build the host tools if not done already

cd connectedhomeip/connectedhomeip
gn gen out/host
ninja -C build

Generate the Test CD, please make sure to change the -V (vendor_id) and -p (product-id) options based on the ones that are being used. For more info about the arguments, please check here.

out/host/chip-cert gen-cd -f 1 -V 0xFFF1 -p 0x8001 -d 0x0016 \
                          -c "CSA00000SWC00000-01" -l 0 -i 0 -n 1 -t 0 \
                          -K credentials/test/certification-declaration/Chip-Test-CD-Signing-Key.pem \
                          -C credentials/test/certification-declaration/Chip-Test-CD-Signing-Cert.pem \
                          -O TEST_CD_FFF1_8001.der

2.6.3 Factory Partition

Factory partition contains basic information like VID, PID, etc, and CD.

Export the dependent tools path

cd esp-matter/tools/mfg_tool
export PATH=$PATH:$PWD/../../connectedhomeip/connectedhomeip/out/host

Generate the factory partition, please use the APPROPRIATE values for -v (Vendor Id), -p (Product Id), and -cd (Certification Declaration).

./mfg_tool.py --passcode 89674523 \
              --discriminator 2245 \
              -cd TEST_CD_FFF1_8001.der \
              -v 0xFFF1 --vendor-name Espressif \
              -p 0x8001 --product-name Bulb \
              --hw-ver 1 --hw-ver-str DevKit

Few important output lines are mentioned below. Please take a note of onboarding codes, these can be used for commissioning the device.

[2022-12-02 11:18:12,059] [   INFO] - Generated QR code: MT:-24J06PF150QJ850Y10
[2022-12-02 11:18:12,059] [   INFO] - Generated manual code: 20489154736

Factory partition binary will be generated at the below path. Please check for <uuid>.bin file in this directory.

[2022-12-02 11:18:12,381] [   INFO] - Generated output files at: out/fff1_8001/e17c95e1-521e-4979-b90b-04da648e21bb

2.6.4 Flashing firmware, secure cert and factory partition

Flashing secure cert partition. Please check partition table for esp_secure_cert partition address.

Note

Flash only if not flashed on manufacturing line.

esptool.py -p (PORT) write_flash 0xd000 secure_cert_partition.bin

Flashing factory partition, Please check the CONFIG_CHIP_FACTORY_NAMESPACE_PARTITION_LABEL for factory partition label. Then check the partition table for address and flash at that address.

esptool.py -p (PORT) write_flash 0x10000 path/to/partition/generated/using/mfg_tool/uuid.bin

Flash application

idf.py flash

2.6.5 Test commissioning using chip-tool

If using the DACs signed by custom PAA that is not present in connectedhomeip repository, then download the PAA certificate, please make sure it is in DER format.

Run the following command from host to commission the device.

./chip-tool pairing ble-wifi 1234 my_SSID my_PASSPHRASE my_PASSCODE my_DISCRIMINATOR --paa-trust-store-path /path/to/PAA-Certificates/

2.7 Matter OTA

  • Enable the CONFIG_ENABLE_OTA_REQUESTOR option to enable Matter OTA Requestor functionality.

Please follow the guide in the connectedhomeip repository for generating a Matter OTA image and performing OTA.

2.7.1 Encrypted Matter OTA

The esp-matter SDK supports using a pre-encrypted application image for OTA upgrades. Please follow the steps below to enable and use encrypted application images for OTA upgrades.

  • Enable the CONFIG_ENABLE_OTA_REQUESTOR and CONFIG_ENABLE_ENCRYPTED_OTA options

  • The application code must make an API call to esp_matter_ota_requestor_encrypted_init() after calling esp_matter::start(). You can use the following code as a reference:

#include <esp_matter_ota.h>

{
    const char *rsa_private_key;    // Please set this to the buffer containing RSA 3072 private key in PEM format
    uint16_t rsa_private_key_len;   // Please set this to the length of RSA 3072 private key

    esp_err_t err = esp_matter_ota_requestor_encrypted_init(rsa_private_key, rsa_private_key_len);
}
  • Please refer to the guide in the connectedhomeip repository for instructions on how to generate a private key, encrypted OTA image, and Matter OTA image.

Note

There are several ways to store the private key, such as hardcoding it in the firmware, embedding it as a text file, or reading it from the NVS. We have demonstrated the use of the private key by embedding it as a text file in the light example.

2.8 Mode Select

This cluster provides an interface for controlling a characteristic of a device that can be set to one of several predefined values. For example, the light pattern of a disco ball, the mode of a massage chair, or the wash cycle of a laundry machine.

2.8.1 Attribute Supported Modes

This attribute is the list of supported modes that may be selected for the CurrentMode attribute. Each item in this list represents a unique mode as indicated by the Mode field of the ModeOptionStruct. Each entry in this list SHALL have a unique value for the Mode field. ESP_MATTER uses factory partition to set the values of Supported Modes attribute.

2.8.2 Generate Factory Partition Using mfg_tool

Use mfg_tool to generate factory partition of the supported modes attribute.

2.8.2.1 Usage

cd tools/mfg_tool
./mfg_tool.py -cn "My bulb" -v 0xFFF2 -p 0x8001 --pai \
-k path/to/esp-matter/connectedhomeip/connectedhomeip/credentials/test/attestation/Chip-Test-PAI-FFF2-8001-Key.pem \
-c path/to/esp-matter/connectedhomeip/connectedhomeip/credentials/test/attestation/Chip-Test-PAI-FFF2-8001-Cert.pem \
-cd path/to/esp-matter/connectedhomeip/connectedhomeip/credentials/test/certification-declaration/Chip-Test-CD-FFF2-8001.der \
--supported-modes mode1/label1/endpointId/"value\mfgCode, value\mfgCode"  mode2/label2/endpointId/"value\mfgCode, value\mfgCode"
  • For empty Semantic Tags list

--supported-modes mode1/label1/endpointId  mode2/label2/endpointId

2.8.3 Build example

For example we want to use mode_select cluster in light example.

  • Add source and include path to example/light/main/CMakeList.txt

Append "${MATTER_SDK_PATH}/examples/platform/esp32/mode-support" to SRC_DIRS and PRIV_INCLUDE_DIRS
  • In file example/light/app_main.cpp.

#include <static-supported-modes-manager.h>

{
    cluster::mode_select::config_t ms_config;
    cluster_t *ms_cluster = cluster::mode_select::create(endpoint, &ms_config, CLUSTER_FLAG_SERVER, ESP_MATTER_NONE_FEATURE_ID);

    ModeSelect::StaticSupportedModesManager::getStaticSupportedModesManagerInstance().InitEndpointArray(get_count(node));
}

2.9 Matter Controller

This section introduces the Matter controller example. Now this example supports the following features of the standard Matter controller:

  • BLE-WiFi pairing

  • BLE-Thread pairing

  • On-network pairing

  • Invoke cluster commands

  • Read attributes commands

  • Read events commands

  • Write attributes commands

  • Subscribe attributes commands

  • Subscribe events commands

  • Group settings command.

2.9.1 Device console

Once you have flashed the controller example onto the device, you can use the device console to commission the device and send commands to the end-device. All of the controller commands begin with the prefix matter esp controller.

2.9.2 Pairing commands

The pairing commands are used for commissioning end-devices and are available when the Enable matter commissioner option is enabled. Here are three standard pairing methods:

  • Onnetwork pairing. Prior to executing this commissioning method, it is necessary to connect both the controller and the end-device to the same network and ensure that the commissioning window of the end-device is open. To complete this process, you can use the command matter esp wifi connect. After the devices are connected, the pairing process can be initiated.

    matter esp wifi connect <ssid> <password>
    matter esp controller pairing onnetwork <node_id> <setup_passcode>
    
  • Ble-wifi pairing. This pairing method is supported for ESP32S3. Before you execute this commissioning method, connect the controller to the Wi-Fi network and ensure that the end-device is in commissioning mode. You can use the command matter esp wifi connect to connect the controller to your wifi network. Then we can start the pairing.

    matter esp wifi connect <ssid> <password>
    matter esp controller pairing ble-wifi <node_id> <ssid> <password> <pincode> <discriminator>
    
  • Ble-thread pairing. This pairing method is supported for ESP32S3. Before you execute this commissioning method, connect the controller to the Wi-Fi network in which there is a Thread Border Router (BR). And please ensure that the end-device is in commissioning mode. You can use the command matter esp wifi connect to connect the controller to your Wi-Fi network. Get the dataset tlvs of the Thread network that the Thread BR is in. Then we can start the pairing.

    matter esp wifi connect <ssid> <password>
    matter esp controller pairing ble-thread <node_id> <dataset_tlvs> <pincode> <discriminator>
    

2.9.3 Cluster commands

The invoke-cmd command is used for sending cluster commands to the end-devices. It utilizes a cluster_command class to establish the sessions and send the command packets. The class constructor function could accept two callback inputs:

  • Success callback: This callback will be called upon the reception of the success response. It could be used to handle the response data for the command that requires a reponse. Now the default success callback will print the response data for GroupKeyManagement, Groups, Scenes, Thermostat, and DoorLock clusters. If you want to handle the response data in your example, you can register your success callback when creating the cluster_command object.

  • Error callback: This callback will be called upon the reception of the failure response or reponse timeout.


  • Send the cluster command:

    matter esp controller invoke-cmd <node-id | group-id> <endpoint-id> <cluster-id> <command-id> <command-data>
    

Note

  • The command-data should utilize a JSON object string and the name of each item in this object should be \"<TagNumber>:<DataType>\" or \"<TagName>:<TagNumber>:<DataType>\". The TagNumber should be the same as the command parameter ID in Matter SPEC and the supported DataTypes are listed in $ESP_MATTER_PATH/components/esp_matter/utils/json_to_tlv.h

  • For the DataType bytes, the value should be a Base64-Encoded string.

Here are some examples of the command-data format.

  • For MoveToLevel command in LevelControl cluster, the command-data ({"level": 10, "transitionTime": 0, "optionsMask": 0, "optionsOverride": 0}) should be:

    matter esp controller invoke-cmd <node-id> <endpoint-id> 8 0 "{\"0:U8\": 10, \"1:U16\": 0, \"2:U8\": 0, \"3:U8\": 0}"
    
  • For KeySetWrite command in GroupKeyManagement cluster, the command-data ({"groupKeySet":{"groupKeySetID": 42, "groupKeySecurityPolicy": 0, "epochKey0": d0d1d2d3d4d5d6d7d8d9dadbdcdddedf, "epochStartTime0": 2220000, "epochKey1": null, "epochStartTime1": null, "epochKey2": null, "epochStartTime2": null}}) should be:

    matter esp controller invoke-cmd <node-id> <endpoint-id> 63 0 "{\"0:OBJ\": {\"0:U16\": 42, \"1:U8\": 0, \"2:BS\": \"0NHS09TV1tfY2drb3N3e3w==\", \"3:U64\": 2220000, \"4:NULL\": null, \"5:NULL\": null, \"6:NULL\": null, \"7:NULL\": null}}"
    
  • For AddGroup command in Groups cluster, the command-data ({"groupID": 1, "groupName": "grp1"}) should be:

    matter esp controller invoke-cmd <node-id> <endpoint-id> 0x4 0 "{\"0:U16\": 1, \"1:STR\": \"grp1\"}"
    

2.9.4 Read commands

The read_command class is used for sending read commands to other end-devices. Its constructor function could accept two callback inputs:

  • Attribute report callback: This callback will be called upon the reception of the attribute report for read-attribute commands.

  • Event report callback: This callback will be called upon the reception of the event report for read-event commands.

2.9.4.1 Read attribute commands

The read-attr commands are used for sending the commands of reading attributes on end-devices.

  • Send the read-attribute command:

    matter esp controller read-attr <node-id> <endpoint-id> <cluster-id> <attribute-id>
    

2.9.4.2 Read event commands

The read-event commands are used for sending the commands of reading events on end-devices.

  • Send the read-event command:

    matter esp controller read-event <node-id> <endpoint-id> <cluster-id> <event-id>
    

2.9.5 Write attribute commands

The write-attr command is used for sending the commands of writing attributes on the end-device.

  • Send the write-attribute command:

    matter esp controller write-attr <node-id> <endpoint-id> <cluster-id> <attribute-id> <attribute-value>
    

Note

  • attribute_value should utilize a JSON object string. And the format of this string is the same as the command_data in cluster commands. This JSON object should contain only one item that represents the attribute value.

Here are some examples of the attribute_value format.

For StartUpOnOff attribute of OnOff Cluster, you should use the following JSON structures as the attribute_value to represent the StartUpOnOff 2 and null:

matter esp controller write-attr <node_id> <endpoint_id> 6 0x4003 ``"{\"0:U8\": 2}"``
matter esp controller write-attr <node_id> <endpoint_id> 6 0x4003 ``"{\"0:NULL\": null}"``

For Binding attribute of Binding cluster, you should use the following JSON structure as the attribute_value to represent the binding list [{"node":1, "endpoint":1, "cluster":6}]:

matter esp controller write-attr <node_id> <endpoint_id> 30 0 ``"{\"0:ARR-OBJ\":[{\"1:U64\":1, \"3:U16\":1, \"4:U32\": 6}]}"``

For ACL attribute of AccessControl cluster, you should use the following JSON structure as the attribute_value to represent the AccessControlList [{"privilege": 5, "authMode": 2, "subjects": [112233], "targets": null}, {"privilege": 4, "authMode": 3, "subjects": [1], "targets": null}]:

matter esp controller write-attr <node_id> <endpoint_id> 31 0 "{\"0:ARR-OBJ\":[{\"1:U8\": 5, \"2:U8\": 2, \"3:ARR-U64\": [112233], \"4:NULL\": null}, {\"1:U8\": 4, \"2:U8\": 3, \"3:ARR-U64\": [1], \"4:NULL\": null}]}"

2.9.6 Subscribe commands

The subscribe_command class is used for sending subscribe commands to other end-devices. Its constructor function could accept four callback inputs:

  • Attribute report callback: This callback will be invoked upon the reception of the attribute report for subscribe-attribute commands.

  • Event report callback: This callback will be invoked upon the reception of the event report for subscribe-event commands.

  • Subscribe done callback: This callback will be invoked when the subscription is terminated or shutdown.

  • Subscribe failure callback: This callback will be invoked upon the failure of establishing CASE session.

2.9.6.1 Subscribe attribute commands

The subs-attr commands are used for sending the commands of subscribing attributes on end-devices.

  • Send the subscribe-attribute command:

    matter esp controller subs-attr <node-id> <endpoint-id> <cluster-id> <attribute-id> <min-interval> <max-interval>
    

2.9.6.2 Subscribe event commands

The subs-event commands are used for sending the commands of subscribing events on end-devices.

  • Send the subscribe-event command:

    matter esp controller subs-event <node-id> <endpoint-id> <cluster-id> <event-id> <min-interval> <max-interval>
    

2.9.7 Group settings commands

The group-settings commands are used to set group information of the controller. They are available when the Enable matter commissioner option is enabled in menuconfig. If the controller wants to send multicast commands to end-devices, it should be in the same group as the end-devices.

  • Set group information of the controller:

    matter esp controller group-settings show-groups
    matter esp controller group-settings add-group <group-id> <group-name>
    matter esp controller group-settings remove-group <group-id>
    matter esp controller group-settings show-keysets
    matter esp controller group-settings add-keyset <ketset-id> <policy> <validity-time> <epoch-key-oct-str>
    matter esp controller group-settings remove-keyset <ketset-id>
    matter esp controller group-settings bind-keyset <group-id> <ketset-id>
    matter esp controller group-settings unbind-keyset <group-id> <ketset-id>
    

2.9.8 Attestation Trust Storage

The controller example offers two options for the Attestation Trust Storage which is used to store and utilize the PAA certificates for the Device Attestation verification. This feature is available when the Enable matter commissioner option is enabled in menuconfig. You can modify this setting in menuconfig Components -> ESP Matter Controller -> Attestation Trust Store

  • Attestation Trust Store - Test

    Use two hardcoded PAA certificates(Chip-Test-PAA-FFF1-Cert&Chip-Test-PAA-NoVID-Cert) in the firmware.

  • Attestation Trust Store - Spiffs

    Read the PAA root certificates from the spiffs partition. The PAA der files should be placed in paa_cert directory so that they can be flashed into the spiffs partition of the controller.